Andrew is absolutely planning on telling everyone he knows who knows Daine about the party. Of course, that probably still won't make for all that many guests, since they have a surprisingly small overlap of friends and acquaintances. Still, he can surely drum up enough people to make it a proper party.

"It's a tradition!" he beams. He'd share it with her right now, but it really ought to be a surprise -- she ought to have more than one person singing out of key at her the first time she hears it, and it ought to be for her birthday, not just a warmup. "A tradition less than a hundred years old right now, but a tradition."